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=== === <><><> If you needed to ask this question here, one of the most important things you must learn is how to use an electrician's multi-meter correctly and safely. This is one of those questions... If you know this little, you shouldn't be planning to do what you are planning... No disrespect intended, but this is SO basic that it suggests you have not studied the subject at all! There are many good reference books and course books to study from. === === <><><> This question is not as easy to answer as you may at first think. It all depends if you really know what you mean when you say "a positive wire" and "a negative wire". Are you asking about an AAA cell or are you asking about mains voltage alternating current? So take the advice given above and learn how to use a multimeter - safely - to measure voltages and currents used by electrical items or systems. Some of them use direct current power supplies, such as dry cells or batteries; other things use alternating current power supplies such as 120 Volt or 240 Volt power mains. You really need to know about both types because none of them are safe to play with, not even the simplest dry cell or battery. If you want to ask this type of question again please be sure to say: * exactly what type of electrical item or system it is that you want to know about
and
* where those wires are on (or in) the item or system that you are curious to know about which wires are positive or negative. Then someone may be able to help you by giving you a more specific answer.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work AND
always use an electrician's test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure the circuit is, in fact, de-energized.
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Is the hot wire labeled positive or negative?
Hot is positive.
Is there a difference between black wire and red wire?
Yes, the red wire is a positive wire (+) and the black wire is a negative wire (-) :D
Which wire colors for 12v battery?
Red to positive, black to negative
Which wire is negative and which is positive if there is a red and white wire?
Commonly the red should be positive but not always. Use a volt meter to find out for sure. Really need more information as to what this wire is for and where it is located to give a good answer.
How do you wire -48v dc power and ground to earth?
always think of any supply system so : RED = MOST POSITIVE BLACK = MOST NEGATIVE in a telecom system the -48V supply is refferenced to ground and earth, so the supply wire is NEGATIVE, this means a DC supply most positive signal the RED wire, go to EARTH = ZERO, the BLACK wire is the MOST negative, so in this case it is -48V
